Abstract
In the wake of recent strong earthquakes in Croatia, there is a need for a detailed and more comprehensive post-earthquake damage assessment. Given that masonry structures are highly vulnerable to horizontal actions caused by earthquakes and a majority of the Croatian building stock is made of masonry, this field is particularly important for Croatia. In this paper, a complete assessment of an educational building in Zagreb Lower Town is reported. An extensive program of visual inspection and geometrical surveys has been planned and performed. Additionally, an in situ shear strength test is presented. After extensive fieldwork, collected data and results were input in 3Muri software for structural modeling. Moreover, a non-linear static (pushover) analysis was performed to individuate the possible failure mechanisms and to compare real-life damage to software results.
Highlights
On 22 March 2020, at 6 h 22 min, Zagreb Metropolitan area was hit by an earthquake of medium magnitude ML = 5.5, and intensity of VII, in the epicenter, according to the EMS-98 scale [1]
At the end of the year, Croatia was hit by another devastating earthquake with an epicenter in Petrinja, located approx. 50 km from Zagreb (ML = 6.3)
Based on the available state-of-the-art literature on assessment and rehabilitation of existing masonry structures (e.g., [19,20,21,22,23]), this paper presents the Croatian perspective and shows it on an actual case study
Summary
On 22 March 2020, at 6 h 22 min, Zagreb Metropolitan area was hit by an earthquake of medium magnitude ML = 5.5, and intensity of VII, in the epicenter, according to the EMS-98 scale [1]. At 7 h 1 min followed the strongest subsequent earthquake of magnitude ML = 5.0 and intensity of VI. The main earthquake damaged most of the buildings in the Lower. The vast majority of buildings built after the first mandatory earthquake regulations in former Yugoslavia (1964) [2,3] either remained intact or suffered small damage. The larger part of the city’s historical center Town) was severely damaged because the buildings in the center were built before any seismic regulations. Churches and university buildings have been severely damaged (Figure 1). The quake caused subsequent damage to already damaged buildings, but to a lesser extent
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